Perhaps you should try some spelling variations:
"coder coder triangular based problem" » "coder poder triangular based problem" (Expand search), "coder lower triangular based problem" (Expand search), "coder node triangular based problem" (Expand search), "coder coder triangular baseado problem" (Expand search), "coder coder triangular basis problem" (Expand search), "coder coder triangular brasil problem" (Expand search), "coder coder triangular based problems" (Expand search), "coder coder triangular based probe" (Expand search), "coder coder triangular posed problem" (Expand search), "coder decoder triangular based problem" (Expand search), "code code triangular based problem" (Expand search), "decoder codec triangular based problem" (Expand search)
"_ python python python programming" » "_ pythons python python programming" (Expand search), "_ piton python python programming" (Expand search), "_ pitons python python programming" (Expand search)

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("coder coder triangular based problem") OR ("_ python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder triangular based problem\") OR (\"_ python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder triangular based problem ) OR ( _ python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder triangular based problem") OR ("_ python python python programming"))*.